Re: [PATCH 04/35] arm64/gcs: Document the ABI for Guarded Control Stacks

On Sun, 16 Jul 2023 22:51:00 +0100 Mark Brown broonie@kernel.org wrote:

Add some documentation of the userspace ABI for Guarded Control Stacks.

Signed-off-by: Mark Brown broonie@kernel.org

Hi Mark,

Nice document. All I could find on a first read was one typo...

...

+7. ptrace extensions +---------------------

+* A new regset NT_ARM_GCS is defined for use with PTRACE_GETREGSET and

• PTRACE_SETREGSET.

+* Due to the complexity surrounding allocation and deallocation of stakcs and

stacks

• lack of practical application changes to the GCS configuration via ptrace
• are not supported.